If I parallel two 10s4p packs made from different cells, samsung 26H & 29F, which are max rated as 5.2Ah (x4=20.8 ) and 8.25Ah (x4=33) respectively, and I occasionally draw 25A for short periods; what happens?
Update: With more reading and thought I now think that the instantaneous demand will draw equally from both packs; but the lesser pack will go to a lower voltage, at which point there will be a net flow from the larger to the smaller until their voltages equalise.
Does that make sense? Can I treat the combined pack as a single 22Ah and ignore the differences?
I see several possibilities and I have no idea which is correct:
1) Most of the draw will come from the higher C-rate pack and the lesser one will make up the shortfall.
2) The lower C-rate pack will supply it's max, and the rest will be drawn from the higher rate pack.
3) 25A will be drawn from both packs, quickly wrecking the lower rate pack.
4) 12.5A will come from each pack until the power rate pack runs out of juice.
Update: With more reading and thought I now think that the instantaneous demand will draw equally from both packs; but the lesser pack will go to a lower voltage, at which point there will be a net flow from the larger to the smaller until their voltages equalise.
Does that make sense? Can I treat the combined pack as a single 22Ah and ignore the differences?
I see several possibilities and I have no idea which is correct:
1) Most of the draw will come from the higher C-rate pack and the lesser one will make up the shortfall.
2) The lower C-rate pack will supply it's max, and the rest will be drawn from the higher rate pack.
3) 25A will be drawn from both packs, quickly wrecking the lower rate pack.
4) 12.5A will come from each pack until the power rate pack runs out of juice.